Disclaimer that I have no clue how coaster trains are built.Do to insurance and Philadelphia Toboggan's unwillingness to both certify them safe to operate in that configuration or service them if they were run that way. That makes fir a fairly compelling argument not to do it in my humble opinion.
What if they disassembled the train from the deck up (so seats, front, backing, sides, restraints), and just reassembled that backwards. So the base part (wheels ext) were still operating “forwards” while the seats just are operating backwards.